A 75 kg bungee jumper leaps from a bridge. When he is 30 meters above the water, and moving at a speed of 20 m/s, the bungee cord begins to stretch. The cord stops his motion exactly at the water surface. Determine the spring constant of the bungee cord. Assume no thermal losses.
Solved
Show answers
More tips
- F Family and Home How to Choose a Name for Your Baby?...
- B Business and Finance How to Open an Online Store? A Detailed Guide for Beginners...
- W Work and Career How to Write a Resume That Catches the Employer s Attention?...
- C Computers and Internet Е-head: How it Simplifies Life for Users?...
- F Family and Home How to Choose the Best Diapers for Your Baby?...
- F Family and Home Parquet or laminate, which is better?...
- L Leisure and Entertainment How to Properly Wind Fishing Line onto a Reel?...
- L Leisure and Entertainment How to Make a Paper Boat in Simple Steps...
- T Travel and tourism Maldives Adventures: What is the Best Season to Visit the Luxurious Beaches?...
- H Health and Medicine Kinesiology: What is it and How Does it Work?...
Answers on questions: Physics
- P Physics The National Institute of Standards and Technology (NIST) supplies a standard liquid whose electrical conductivity is supposed to be exactly 5. A certain shipment of...
- P Physics If a swimmer is traveling at a constant speed of 0.85 m/s, how long would it take to swim the length of a 50-meter olympic-sized pool?...
- P Physics Electromagnetic waves, which include light, consist of vibrations of electric and magnetic fields, and they all travel at the speed of light. a.) fm radio. find the wavelength...
- P Physics Aspacecraft is in orbit around jupiter. the radius of the orbit is 2.800 times the radius of jupiter (which is rj = 71,490 km). the gravitational field at the surface...
- P Physics What is the equation showing the decay of lanthanum (La) 140 into cerium (Ce)...
- P Physics A body is charged in three ways. State these 3 ways and briefly explain....
- P Physics An electron is moving with uniform circular motion around a circle of radius 6 cm. Its initial rotational kinetic energy is 24 J. If its (translational) speed doubled...
- P Physics A loaded truck (truck 1) has a maximum engine power P and is able to attain a maximum speed v. Another truck (truck 2) has a maximum engine power 2P and can attain a...
- S SAT Name the early individuals who had a major impact on the American public s awareness of the environment and sustainability, and explain their accomplishments...
- G Geography What are the two education variables used as a part of the HDI index and why does education matter when analyzing a nation s social and economic development?...
Ответ:
k = 52.2 N / m
Explanation:
For this exercise we are going to use the conservation of mechanical energy.
Starting point. When it is 30 m high
Em₀ = K + U = ½ m v² + m g h
Final point. Right when you hit the water
in this case the distance the bungee is stretched is 30 m
x = h
as they indicate that there are no losses, energy is conserved
Em₀ = Em_{f}
½ m v² + m g h = ½ k h²
k =![\frac{m (v^{2} + 2 g h)}{h^{2} }](/tpl/images/1028/1168/f067f.png)
let's calculate
k =![\frac{75 \ ( 20^{2} + 2 \ 9.8 \ 30)}{30^{2} }](/tpl/images/1028/1168/6e1e6.png)
k = 52.2 N / m
Ответ:
charge because it doesnt matter if it is a negative or positive